oh man, that album is recorded perfectly. i'm not sure how grainy yours sounds, but the one i know does have a gritty sound to it. what he accomplished with so little is incredible.
it's grainy, no doubt, with bathory or a lot of black metal/grainy stuff i usually use an EQ and turn down the highs and the preamp too if it has one. i literally have a bathory setting on my stereo because it's all got that snowy static overtone.